S&S Cycle Engine Performance Kit - 4.125" Bore - 124ci - 900-0565

Unleash the full potential of your Twin Cam motorcycle with the S&S Cycle 124" Hot Set Up® Engine Performance Kit. This comprehensive kit transforms your stock engine into a high-performance powerhouse, delivering increased horsepower and torque for an exhilarating riding experience. Designed for enthusiasts and professionals alike, this kit combines premium components and precision engineering for unmatched reliability and performance.

Description

This S&S Cycle 124" engine kit allows you to convert your stock balanced Twin Cam engine to a monstrous 124 cubic inches while utilizing your stock crankcases. The kit features S&S Super Stock® 91cc cylinder heads, ensuring optimal airflow and combustion. The 4.125" big bore cylinders, combined with forged big bore flat top pistons, maximize displacement and power output. The S&S 4.625" stroke flywheel assembly and S&S 640 gear drive Easy Start cams provide smooth and reliable performance throughout the RPM range. Premium tappets, adjustable pushrods, and roller rocker arms ensure quiet and efficient valve train operation. Installation is straightforward with included hardware, gaskets, and detailed instructions. Note that the EFI system must be recalibrated after installation to ensure optimal fuel delivery and performance. Although the engine is 0.960" taller than stock, no frame clearance issues will occur, and a stock EFI throttle body will fit.

Features & highlights

• Transforms your stock Twin Cam engine to a high-performance 124" powerhouse.
• S&S Super Stock® 91cc cylinder heads for superior airflow and combustion.
• 4.125" big bore cylinders and forged pistons maximize displacement and power.
• S&S 4.625" stroke flywheel assembly and 640 gear drive cams for smooth, reliable power.
• Premium components ensure durability and long-lasting performance.
• Easy Start cams eliminate hard starting issues.
• Made in the USA.

Technical specifications

• Brand: S&S Cycle
• Displacement: 124"
• Bore Size: 4.125"
• Stroke Length: 4.625"
• Compression Ratio: 11.0:1
• Cam Drive Type: Gear
• Cylinder Head Volume: 91cc
• Type: Engine Performance Kit
• Color/Finish: Wrinkle Black, Powder Coated

Important to know

This kit requires recalibration of the EFI system after installation. Fuel or ignition system components are not included and must be sourced separately. All clearances and assembly specifications must be carefully checked during installation. Although the engine is 0.960" taller than stock, there are no frame clearance problems, and a stock EFI throttle body will fit.